Window lock



J. W. KUHRT Feb. 23, 1932.

WINDOW LOCK Filed Feb.

John MKM/hr1* Patented Feb. 23, 1932 UNITED STATES JOHN W. KUHRT, OIFTOLEDO, OHIO WINDOW LOCK .Application led February 5, 1931. Serial No.513,472.

This invention relates to locks for windows of the sliding double-sashtype and has for its object the provision of a simple, improved andeasily installed lock of this character which is operable to lock thetwo sash of the window in any position of relative adjustment and tobind the sash firmly together in partially open or closed positions toprevent rattling.

The invention is fully described in the following specification, andwhile in its broader aspect it is capable ot' embodiment in numerousforms, one embodiment thereof is illustrated in the accompanyingdrawings, in which Figure l is a fragmentary perspective view of a pairof window sash equipped with lmy improved lock and secured togetherthereby in closed position. Fig. 2 is a fragmentary horizontal sectiontaken on the line 2--2 in Fig. 1 with the locking arm removed.

Fig. 3 is a section on the line 3-3 in Fig. 1.

Fig. 4 is an enlarged detail of the guide member of the lock and itsmanner of attaching to the upper sash, with parts in section, and

Fig. 5 is an enlarged side elevation of a portion of the guide rod andof the locking arm in engagement therewith with portions of the latterbroken away.

Referring to the drawings, 1 and 2 designate the upper and lower sash,respectively, of a window disposed in the same relation they would havein a window casing (not shown) to permit relative raising and loweringmovements thereof as is customary with window sash of this character.

The locking means embodying the invention includes a guide rod orstandard 3, preferably 10 or 12 inches in length, fixed to and risingfrom the top of the lower cross member of the upper sash adjacent to oneside upright thereof in slightly spaced parallel relation thereto andhaving its upper end angled or otfset, as at 4, and fixed to the innerside of the adjacent sash upright by a screw 5.

The guide member 3, for the purpose of strength, preferably comprises anouter tubular member 6 (Fig. 4) and an inner reinforcing member 7 of rodform fitted in the tubular member and extending from the upper offsetend 4 of the latter to a distance below the tubular member. The lowerextended end of the rod member 4; is sharpened to adapt it to be forcedinto the lower cross member of the upper sash 1 for anchoring purposes.The member 6 is further secured at its lo-wer end to the sash l by abase plate 8, which has a hole for snugly receiving Said member and issecured to the top surface of the lower cross member of the upper sashby a single screw 9. It is thus apparent that the guide member 3 can besecurely and easily fastened to the sash by merely forcing the lowerprojecting end of the rod 7 into the cross member of the sash and thenusing a single screw for securing each the plate 8 and other end of themember 6 to the sash.

A locking arm l() projects fromthe guide member 3, having a hole throughits inner end which loosely receives the guide member to permit the armto be :freely moved up and down on the guide member, except when the armis canted relative thereto to cause diagonally opposite edge walls ofits opening to have gripping engagement with the guide member asindicated in Fig. 5. The arm 10, if swung outward from the upper sash,so that this outer end projects over the top of the lower sash, restsonthe latter whether in closed or partially open position, and coactswith the guide member to prevent a relative inward movement of the twosash, that is, a relative raising of one and lowering of the other, forit is apparent that any relative inward movement of either sash willimpart a further canting `movement or pressure to the lever arm to causeit to increase its gripping engagement with the guide member.

For the purpose of greater security and also to cause the lock to effecta binding ac- 90 tion between the two sash, I provide a plate 11 at theouter top edge of the lower sash in opposition to the guide member 3 andprovide such plate with a forwardly projecting arcuate cam surface 12with which a locking finger 13 on the outer end portion of the arm l()may have locking engagement. The iinger 13 is pivoted on the arm 10 tohave swinging movements in a plane transverse thereto, and it is notchedto inter-engage with the arcuate flange on the plate 11 which forms thecam surface 12. It is thus apparent that the finger 13 may be engagedwith the cam 12 and cooperate therewith and with the arm 10 and guidemember 3 to draw the associated portions of the two sash firmly togetherwhen the finger is swung, in the present instance, in clockwisedirection, into binding engagement with the cam. The nger 18 is retainedon the stud end portion 14 of the arm 10 by a nut 15. It is preferableto have the length of engagement of the nut with the stud 14suliiciently long to allow for an adjustment of the nut sothat one ormore spacing washers 16 may be inserted or removed' from between the nutand finger, depending'on the thickness of the top member of the lowersash, or to compensate for a slight variance in the position of mountingof the guide member 3 on the upper sash. The'plate 11 has a depression17 in its top edgeiin which the arm 10 seats when locked thereto.

Itis sometimes desirable to have 'the locking arm 10 held in elevatedposition on the guide member 3 free from engagement with the lower sashand this may be accomplished by providing a notch4 or recess 1S in theupper end portion of the guide member 3 with which the lower edge wallof the locking arm opening may be engaged, as indicated in dotted linesin Fig. 1.

I wish it understood that my invention is not limited to any specificconstruction, arrangement or form of the parts, as it is capable ofnumerous modifications and changes without departing from the spirit ofthe claims.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent is:

1. The combination with a pair of window sash mounted for verticalsliding movement, of a vertical guide member secured to the upper sash,a locking arm slidingly mounted on said member and adapted to projectlaterally therefrom over the adjacent end of the other sash and to belocked to saidmember by canting pressure relative thereto, and a fingerpivotallyV carried by said arm and adapted to have camming connectionwith the lower'sash to bind it to the upper sash in adjusted relationthereto.

2. The combination with a pair of window sash mounted for verticalsliding movements, of a vertical guide member secured to the upper sash,a locking arm slidingly mounted onV said member and adapted to projectlaterally therefrom over the upper end ofthe other sash and to be lockedto said member by canting pressure relative thereto, a cam membersecured to the top portion of the lower sash in opposition to the uppersash,- and a finger movably carried by said arm and adapted to haveengagement with said cam member to cooperate with the arm and guidemember to firmly clamp the sash in predetermined relation.

3. The combination with a pair of window sash mounted for verticalsliding movements, of a vertical guide member secured to the upper sash,a locking arm slidingly mounted on said member and adapted to projectlaterally therefrom over the upper end of the other sash andto be lockedto said member by canting pressure relative thereto, a cam membersecured to the top portion of the lower sash in opposition to the uppersash, and a linger movably' carried by said arm and adapted to haveengagement with said 'cam member to cooperate with the arm and guidemember to firmly clamp the sash in predetermined relation, and means foradjusting said finger lengthwise of the arm.

4. The combination with a pair of window sash mounted for verticalsliding movements, of a vertical guide member secured to the upper sash,a locking arm slidingly mounted on said member and adapted to projectlaterally therefrom over the upper end of the other sash and to belocked to said member by canting pressure relative thereto, a cam membersecured to the top portion of the lower sash in opposition to the uppersash, and-afinger movably carried by said arm and adapted to haveengagement with said cam member to cooperate with the arm and guidemember to rmly clamp the sash in predetermined relation, a nut threadedon the outer end of the arm to hold the finger. in opposition thereon,and spacing washers between the nut and linger capable of removal forlengthwise adj ustment of the finger on the arm.

5. The combination with a pair of window sash mounted for verticalsliding movements, of a vertical guide member secured to the upper sash,a locking arm slidingly mounted on said guide member and adapted toproject laterally therefrom over the upper end ofthe f other sash and tobe locked to said member by cant-ing pressure relative thereto, a lingerpivotally mounted on the outer end of said arm, a plate secured to thetop edge of the lower sash opposed to the upper sash, said plate havinga notch in its top forming a seat for said armV and having a cam portionprojecting away from the sash with which said finger may have lockingcamming engagement to draw` thel adjacent end portions of the two sashtogether and to lock the arm in its said seat.

6. The combination with a pair of window sash mounted for verticalsliding movements, of a vertical guide member rising from the crossmember of the upper sash and secured thereto at one end and at itsoppositeend to a side portion ofthe sash, said guide member comprising atubular part with its upper offsetV end lsecured to` the side memberofthe sash, a plate receiving the lower end of said tubular part andsecured to the cross memher of the upper sash, a rod tted in saidtubular part substantially throughout its length and having its lowerend projected beloW the tubular part and inserted in the cross member ofthe sash, and a locking arm slidngly mounted on said guide member andcooperating therewith to lock the two sash in adjusted relation.

In testimony whereof I have hereunto signed my name to thisspecification.

JOHN W. KUI-IRT.

